Heat-regulator



L. H. HARLOW.

HEAT REGULATOR.

APPLICATION FILED 05c. 20. 191.6.

1,355,041 Patented Oct. 5, 1920,

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LEE H. HARLOW, OF GALESBURG, ILLINOIS, ASSIGNOR TO MINNEAPOLIS HEATREGU- LATOR COMPANY, OF MINNEAPOLIS, MINNESOTA, A CORPORATION. I

HEAT-REGULATOR.

Specification .of Letters Patent.

Patented Oct. 5, 1920.

Application filed December 20, 1916. Serial No. 138,134.

To all whom it may concern:

Be it known that I, LEE- H. HARLOW, a citizen of the United States,residing at Galesburg, county of Knox, State of Illinois, have inventedcertain new and useful Improvements in Heat-Regulators, of which thefollowing is a specification.

tain the temperature of any room in the building.

Fig. 2 is a diagrammatic view, illustrating my invention .applied to aheating apparatus.

In the drawing, 2 represents a plate placed in the basement or any othersuitable place remote from the thermostat and provided with graduations3 and an indicator hand 4 movable over said graduations, said hand beingpivoted at a point intermediate to its ends and provided at one end withan armature 5 for the solenoid 6. An electric circuit 7 is connected tothe solenoid coil 6 and to a source of electrical energ such as a dynamo8 for generating alternating current, and is also connected to a contact9 on the plate 2 and through this contactwith a switch 10 mounted on thebase 2 and connected by a conductor 11 with the coil 6. By meansof thisswitch the circuit may be open or closed through the coil.6.

At some remote point, as in a distant room of the building, thethermostatic device is located, consisting preferably of a casing 12having perforations 13 therein and provided with bearings for a seriesof hollow disks arranged one above the other therein. These disks arefilled with alcohol or some other volatile fluid which will expand andconto bear on a collar 16', being held in contact therewith by a spring19, the tension of which is increased or decreased through theadjustment of a thumb nut 20 on said rod. A reactance coil 21 isprovided within the casing in the circuit 7 and has an armature 22 thatis connected with the arm 17 so that the rocking of said arm will raiseor lower the armature and withdraw it from the coil 21 or allow it toenter the coil 21 a greater distance. This movement of the armature willresult from-expansion or contraction of the walls of the disks 15through action of the volatile fluid therein, an increase in temperaturecausing the disks to expand against the tension of the spring 19 androcking the arm 17 to lower the armature 22 and increase the voltage ofthe current passing to the solenoid coil 6 and thereupon eflfect acorresponding movement of the armature 5, causing the indicator 1 torock on its pivot and indicate on the graduations a higher degree oftemperature. That is, if the temperature of the room or place I wherethe thermostat is located rises and correspondingly expands thethermostatic disks, then the indicator hand at a distance from thethermostat will point to a higher graduation and the engineer or otherperson in charge of thebuilding will at once know how much thetemperature of the room has risen without making an actual examinationof the thermometer in the room.

In case it is desired to connect a number of rooms with the saidindicator, a series of circuits 23 are provided, connected with thecircuit 7 and with contact points 24 on the plate 2 in position toengage with the switch 10 and allow the person in charge to operate theswitch and determine the temperature of any room with which the devicemay be connected. By means of the adjusting nut 20 the tension of thespring 19 can be increased ordecreased to vary the degree of resistanceto the expansion of the thermostatic disks.

- The device may be connected for indicating the temperature of watertanks, bake ovens, and for various purposes where indication oftemperature is desired at a point remote from the thermostat.

In Fig. 2 I have adapted this same device to the regulation ofa heatingplant without tlieuse of'batteries, sliding contacts, springs orWeights. 25 represents a heating plant of ordinary construction, havingdampers 26 and 27. A bar 28 is pivoted at 29 and has connections 30 and31 with the dampers and is also connected with an armature 32 of a coil33. This coil has an electric circuit 3.4. connected with a generator 35and provided with a switch 36 for opening and closing the circuit. Thethermostat corresponds to the one described with reference to Fig. 1 andI will indicate the casing and the adjusting nut by the same referencenumerals. The expansion and contraction of the thermostatic disks willvary the current and open or close the dampers as the temperature of theroom varies.

The devices shown in Figs. 1 and 2 of the drawing are both used inconnection with an alternating current, varying usually from to volts,the coil 21 in Fig. 1 having the function of a reactance coil inconnection with its armature for varying the voltage and effecting theoperation of the remote thermostat indicator or a damper through suchvarlatlon.

I claim as my invention:

A heat regulator comprising an indicating device having a solenoid coiland an indicator hand connected with the armature thereof, analternating electric circuit for said coil, a series of branch circuitsand a switch therefor, thermostats for said circuits, each having areactance coil and an armature therefor, and a thermostatic deviceconnected with the armature of each thermostat reactance coil forchanging the position thereof and regulating the voltage of thealternating current and causing a corresponding movement of the armatureof said indicating device solenoid coil, whereby a person at theindicator by adjusting said switch can determinethe temperature of anyroom or place where the thermostat in the circuit closed by said switchis located. In witness whereof I have hereunto set my hand this 18th-dayof October, 1916.

LEE H. HARLOW. Witness H. A. ANDERSON.

